INFECTED SEWERS
These sewers are infested with the dead - and you're right in the middle of it.
Map Location: - Sandbox, the Crypt
Map Size: - Relatively small.

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Description:
This map is mainly based off of ghost-merging, as this was my 'expirement map' when I found out the new technique. There's also plenty of ambient sounds, such as fusion coils hidden behind the walls, and far-off explosions, which makes it sound like there's airstrikes going off up above.

Anyways, the map is relatively straight-forward. It's a small system of tunnels that loop together, in no specific pattern whatsoever. There is a sort of control rule, though. I've noticed while playing, there's certain areas where you'll be relatively safe, just based off how many survivors there are. The Survivor Spawn is the safest area, which is inbetween the pipe room and the flooded room, containing the shotgun pit. The Zombies will fly through a pipe from the pipe room, and there's also a Specialized Zombie spawn.

YouTube- Halo 3: Forge Maps: Infected Sewers

HELLSAYER
This zombie spawns high above in the Skybubble, in this evil little red room. There's a custom powerup and a flamethrower, which the Zombie is enabled to grab once he has gotten the custom powerup. He must quickly move through the teleporter, climb out the small hole [after throwing out the flamethrower], and pick the flamethrower back up. He has to move fast, and this zombie is DANGEROUS. He can get you from 20 feet away, and pretty much instantly kills you. The only bad thing is that he's weak. He'll die from a short SMG burst, so he'll have to move stealthily.
Also, he doesn't always show up in the game.

WEAPONS
The weapons are extremely simple.
2x SMGs, 1 clip / 0 clip. No Respawn.
3x Magnums, 2 Dual 1-clip / 0 clip. No Respawn.
2x Shotguns, 1 clip / 0 clip. No Respawn.
1x Sentinel Beam, hidden in a pipe near the secondary shotgun.
3x Fragmentation Grenades. No Respawn.
1x Flamethrower, 90 sec respawn, Zombie Only.